And one key note about the difference between Islams troubles today and Christianities troubles a few hundred years ago:

Up until fairly recently, a couple hundred radicles could only kill a couple hundred people they disargeed with. Today, if a couple hundred radicals got an atomic bomb (likely through Iran or N Korea) they could kill tens of millions. I can't imagine what would have happened to the world if Henry VIII or bloody Mary had the firepower that is avaible today through modern technology.